Taking development time into account,
why not just allow smoking in kota insides and doorways (because there is no inside in the smallest one)
or, better yet, allow smoking/drying in all kota squares and make the walls accessible by crawling. I could see crawling under kota walls useful in other situations too.
With possibly the requirement (when smoking) to have a complete kota. (then it can take more time than the cabin, though)